This link more than adequately covers the setup and execution of using a PCF8574 backpack with a standard LCD https://www.instructables.com/id/Using-PCF8574-backpacks-with-LCD-modules-and-Ardui/
The beauty of the backpack is that it reduces all the digital IO needed to run an LCD down to two digital pins!
I have some caveats to identify when working with the NodeMcu ESP8266
Wiring for Node MCU
- See the pinout below for both arduino and the NodeMcu (for wifi version)
- Adjust the Potentiometer for display contrast
Coding
- Coding should be exactly the same as the article above, utilizing the LiquidCrystal_I2c.h
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